Robust and High‑Wettability Cellulose Separators with Molecule‑Reassembled Nano‑Cracked Structures for High‑Performance Supercapacitors  

作　　者：Xiaoyu Wang Wenqiu Zheng Hui Zhao Junying Li Sheng Chen Feng Xu 

机构地区：[1]State Key Laboratory of Efficient Production of Forest Resources,Beijing Key Laboratory of Lignocellulosic Chemistry,Beijing Forestry University,Beijing 100083,People’s Republic of China

出　　处：《Nano-Micro Letters》2025年第7期26-41,共16页纳微快报(英文版)

基　　金：supported by the National Natural Science Foundation of China(No.U22A20422,22178028);the Program of Introducing Talents of Discipline to Universities(Project 111,B21022);the 5·5 Engineering Research&Innovation Team Project of Beijing Forestry University(No.BLRC2023B01)。

摘　　要：Separators in supercapacitors(SCs)frequently suffer from high resistance and the risk of short circuits due to inadequate electrolyte wettability,depressed mechanical properties,and insufficient thermal stability.Here,we develop a high-performance regenerated cellulose separator with nano-cracked structures for SCs via a binary solvent of superbase-derived ionic liquid and dimethylsulfoxide(DMSO).The unique nano-cracks with an average width of 7.45 nm arise from the acceleration of cellulose molecular reassembly by DMSO-regulated hydrogen bonding,which endows the separator with high porosity(70.2%)and excellent electrolyte retention(329%).The outstanding thermal stability(273℃)and mechanical strength(70 MPa)enable the separator to maintain its structural integrity under high temperatures and external forces.With these benefits,the SC utilizing the cellulose separator enables a high specific capacitance of 93.6 F g^(−1) at 1.0 A g^(−1) and a remarkable capacitance retention of 99.5%after 10,000 cycles compared with the commercial NKK-MPF30AC and NKK-TF4030.The robust and high-wettability cellulose separator holds promise as a superior alternative to commercial separators for advanced SCs with enhanced performance and improved safety.

关 键 词：Superbase-derived ionic liquids Molecular reassembly NANO-STRUCTURE Cellulose separators Supercapacitor 

分 类 号：O646[理学—物理化学]